Please help. My last LMP was on 2/27/16 and ended on 3/2/16. I slept with a guy "A"that same night on 3/2/16. I slept with a different man"B" between 3/8/16-3/15/16 almost every night. I am currently pregnant and due in a few weeks. Due date is 12/5/16 according to the ultrasound, and according to LMP is 12/3/16. On 5/5/16 the ultrasound dated the baby at 9 wks 3 days. With a CRL at 26.96mm. Which guy is the father based off of dates. I have read that sperms lives average 72hrs and CAN live longer but is not as healthy. Also I read the first 5 days after a period are what you can call"safe" days. If this is correct, then guy B should be the father. I also have irregular periods. I have been told that since the pregnancy is so well dated that it's almost positive for guy B to be the father. Thank you
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replied March 25th, 2018
Welcome to this forum.
You are right. According to the ovulation calender, you can ovulate only in between day 10 to day 16 of cycle and thus, it is impossible to conceive by a sex act at the end of your bleeding-days. I think, there is least need of speculation here regarding considering guy A as the father.
Hope I can address your query. Please visit your doctor if there is any further confusion as without a clinical examination it is not possible to opine through an online medical forum.

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